Classless.Hasher is a collection of standard hashing and checksum algorithms implemented within the .NET framework (Microsoft, Mono, etc.). It provides a uniform interface to easily use any of the algorithms contained within this library in other programs.

CityHash is a new family of hash functions developed at Google that are thorough and fast. They are not suitable for crypto but are very good on little-endian 64-bit machines, including many current Intel and AMD chips.

hashl creates a database with partial file hashes. It is useful for checking if you already have a copy of files before transferring them over a slow network. It does this by hashing only the first few MiB of every file. This gives it a huge speed advantage at the cost of possible (though pretty improbable) false positives.

JavaScript MD5 Library is a pure JavaScript implementation of the MD5 digest algorithm. It accepts strings, arrays of characters, and arrays of bytes for input (UTF-8 is supported). It works on recent (and not so recent) versions of all major desktop browsers, including IE 6 (6.0.2800.1106) and up. Performance is relatively good (for JavaScript).

securify is a class that generates passwords by replacing random characters in a given password text. A percentage parameter determines the probablity of each character being replaced. It can take a string from the user, or suggest words from a database.

BAD (BAckup Daemon) "watches" a directory and copies any files or directories moved/copied into it to another "backup" directory automatically using inotify. It will automatically generates hashes for files using the md5 hashing algorithm, and stores them in a file for quick and easy integrity checking. It will log (mostly) everything it's doing, and makes it very convenient to grep for certain messages using multiple logging levels which the user can set to get the desired output. It has its own built-in uninstaller which will delete any and all files it has created (besides the user's watch and backup directories).